Having problem with this HP Desktop no video

Ok here is the computer that was purchased HP Debranded TS-0006P-AMDX605. It was bought from newegg, and here is the product page. http://www.neweggbusiness.com/Product/Product.aspx?Item=N82E16883148037

Operating system is windows 7 home premium 64bit



Now when I first got this computer it would not turn on. I procedded to take memory out and put back in and then I got video.



Everything went smooth until I upgraded the memory. Purchase an extra one gigabyte and when I first plugged it in no video.



It was becuase of this post http://h30434.www3.hp.com/t5/Desktop-Hardware/Upgrading-Memory/m-p/1068519#M40677 that i figuredout why there was no video. Once i placed the memory chips in the right slots it started up with no problems.



Now this computer was for a friend who was elderly, did not have that much money, and did not understand computers too much. Whenthis computer is on it runs great and he loves it.



Now here is the problem, he would go to turn it on via the power button, and it would not send video to the monitor, he would then hold the power button for about 5 seconds to shut it down, the try again. It would take him about five tries to get it to come on.



I figured it might be the memory, so i went to his house and took out the memory. Seemed to work ok. Now he is having those problems again, where sometimes when he goes to turn it on, it just does not send any power to the monitor.



Now what I told him to do was, to turn the computer on in the morning and leave it on. Just let the monitor go to sleep. When he is done with the computer in the vening, just turn it off. Now this is working for him, but this should not be happening.



His symptoms are that SOMETIMES when he turns the computer on there is no video signal sent to the monitor.



Please does anyone have a solution, or tell me what to check. I have already put another brand new power supply in which did not fix the problem. Also removed the extra memory that was purchased seperately. Still same issues.



Oh and here is the motherboard that is in the HP Desktop http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=c01925486

 

Does anyone have any suggestions ??